|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||The Effect of Irradiation Induced Defects on Martensitic Transformation in NiTi Shape Memory Alloys
||Taiwu Yu, Alejandro Hinojos, Daniel Hong, Peter Anderson, Michael Mills, Yunzhi Wang
|On-Site Speaker (Planned)
Under the impact of radiation with high energy electrons, defects may be induced in the form of metastable clusters of amorphous phase. Consequently, suppression of thermally induced martensitic transformations (MTs) has been observed in irradiated NiTi, but with an enhancement in the reversible strain. On the other hand, linearized stress-strain responses have been observed in irradiated NiTi during stress-induced MTs, with considerable reversible strains. In this study we employ a phase field model to simulate the B2 to R MT under the effects of irradiation defects. The defect microstructures from the irradiation damage characterized by experiments, in terms of their type, size, number density and spatial distribution, are used directly as model inputs. The simulation results show that such defect clusters are promising to produce quasi-linear pseudoelasticity with ultra-low apparent elastic modulus. This study will inspire the design of shape memory alloys with desired properties by defect engineering using radiation.
||Phase Transformations, Modeling and Simulation, Computational Materials Science & Engineering